Screw-press for molding tablets.



PATENTBD JUNE 18, 1907.

"H; ENDEMANN. SCREW PRESS FOR MOLDING TABLETS.

APPLIOATION FILED APE.22,1907.

F l l L.

HUBERT ENDEMAWN, OF VIENNA, AUSTRIA-HUNGARY.

SCREW-PRESS FOR MOLDING TABLETS.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed April 22,1907. Serial No- 369,682.

To all whom it may concern.-

Be it known that I, HUBERT ENDEMANN, a subject of the Emperor ofAustria, residing at Vienna, in the Province of Lower Austria and Empireof Austria, have invented new and useful Improvements in Screw-Pressesfor Molding Tablets, of which the following is a specification.

My invention relates to screw presses for molding tablets, and it hasfor its object so to construct the press that the turning of the screwcauses the pulverulent material, of which the tablets are to be made, tobe "fed into the matrix and the finished tablets to be thrown out.

According to the invention, the supply hopper is mounted upon a slidingcarriage adapted to move to and fro over the matrix, and the screwcarries a cam by means of which a crank geared with the carriage isoperated. Another cam mounted on the screw passes, on the screw beinglowered, bc low a tappet, which is secured to a spring controlled rodparallel to and guided by the side of the screw, and on the screw beingraised,

the said cam carries the tappet upward, thereby raising the rod, whichis geared with the lower die.

In the drawing, Figure 1 is a sectional front elevation, Fig. 2 asectional side elevation, and Fig. 3 a horizontal section of a screwpress made according to the invention. Fig. 4 is a horizontal section onthe line 44 in Fig. 2.

It will be seen that a screw 1 is movable in a screw-threaded hole in astandard 3 and carries the upper die 4. which is secured to it by meansof a pin 5. The screw 1 also carries a sleeve 2 on which the aforesaidcams 6 and 7 are 'formed and which is fixed to the screw by means of ascrew 8.

Into the base plate of the standard 3 is screwed a screw 9, into thesocket or bore of which the die-carrier 10 is inserted. The saiddie-carrier 10 is surrounded by a collar 11 held in position by theclamping screw 12, which also holds the lower die 13 in the diecarrierlThe matrix 14 is clamped by a screw 15 in a hole of the table 16 cast onthe standard 3 and projecting laterally.

The cylindrical rod 17 designed to operate the lower die 13, forejecting the finished tablet, is guided in holes of the head of thestandard 3, the table 16 and the base-plate. Its lower end carries a nut18 and a counternut 19, which, under the action of the coiled spring 20,surrounding the top of the rod 17, bears against the under side of thecollar 11, and thereby controls the position of the lower die 13. Thespiral spring 21 arranged in a recess of the standard 3 and adapted tobe put in tension by turning the bolt 22, has its free end bearing uponthe collar 11, thereby tending to draw the lower die 13 downward. Thehopper 23 for receiving the material from which the tablets are to bemolded, is mounted upon a carriage 24 adapted to slide in guides formedon the table 16. The said carriage is provided with a transverse groove25 into which takes the crank pin of a crank 26 made of wire and looselymounted upon a tubular standard 27, which is inserted into the table 16and surrounds the cylindrical rod 17. A coiled sprin 28 having its topend secured to the wire crank 26 and its bottom end inserted into a holeof the table 16, always tends to keep the hopper-carriage in theposition shown in Figs. 1 and 3, and is put in tension by thedisplacement of the carriage. The said crank 26 has the portioncorresponding to its eye so shaped that, on the screw 1 descending, thecrank is acted upon by the cam 7. The other cam 6 cooperates with atappet 29 formed on a collar 30, which is fastened to the cylindricalrod 17 and provided with a plane face in contact with a plane plate 31for preventing the rod 17 from turning rormd its axis.

The operation of the machine is as follows: By turning the screw 1 inthe direction of the arrow in Fig. 1, the same is caused to descend, andthe lower cam 7 of the sleeve 2 acts upon the wire crank 26, which isthereby caused to displace the carriage 24 upon which the hopper 23 ismounted. As soon as the carriage 24 is pushed beyond the matrix 14, aconcentric portion of the cam 7 comes into contact with the crank andkeeps the carriage in the position it has attained. The screw 1continuing to descend, a tablet is molded between the upper die 1 andthe lower die 13. During the descent of the screw 1, the upper cam 6passes over the tappet 29, whereby the rod 17 is lowered, and afterward,when the said cam slides beyond the tappet, the spring 20 raises the rod17 into its former position, thereby placing the tappet 29 above the cam6. The pressing of the tablet being finished, the screw 1 is turned inthe opposite direction, and thereby the cam 6 is caused to pass belowthe tap et 29 and to raise, by means of the same, t e rod 17, Whose nut18 carries along the collar 11. As this collar 11 is rigidly connectedwith the lower die 13, this latter is raised and caused to eject themolded tablet. At the same time, the crank 26 is released by the lowercam 7, and under the action of the coiled spring 28 swings backward,carrying along the hopper-carriage 24, which pushes the tablet sidewise.Immediately afterward the cam 6 having hitherto kept the tappet 29raised, slides beyond this tappet, thereby allowing the spiral spring 21to lower the lower die into its normal position. The material containedin the hopper 23 then enters the matrix 14: again. The capacity of thematrix is adjusted by partly screwing the tubular screw 9 in or out, asthis screw supports the lower die 18.

What I do claim as my invention, and desire to secure by Letters Patent,is

1. In a screw press for moldin tablets, the combination with the screwand the matrix of a carriage adapted to slide to and fro over thematrix, a supply hopper carried by the said sliding carriage, a crankgeared with the carriage, a spring tending to keep the carriage abovethe matrix, and a cam mounted on the screw and adapted so to operate thecrank that the carriage is pushed away from the matrix, substantially asand for the purpose described.

2. In a screw press for molding tablets, the combination with the screwand the lower die or movable matrix bottom, of a laterally projectingarm rigidly connected with the lower die, an endwise movable rodparallel to and guided by the side of the screw, a tappet secured to thebottom portion of the said rod in such a osition as to project below thelateral arm 0 the lower die, a spring tending to keep the rod raised, aspring tending to lower the lower die, a second tappet secured to thetop portion of the said rod, and a cam secured to the screw and adaptedso to cooperate with the said second tappet that, on the screw beinglowered, the cam carries along the tappet and passes below the same,

and on the screw belng raised, it raises the tappet, substantially asand for the purpose described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HUBERT ENDEMANN.

Witnesses:

Jos. SoHAscHE, ALvEsTo S. HoGUE.

